flying cat vs placental mammal

flying cat and placental mammal both are nouns.

Word	Noun	Adjective	Verb	Adverb
flying cat	Yes	No	No	No
placental mammal	Yes	No	No	No

As nouns, placental mammal is a hypernym of flying cat; that is, placental mammal is a word with a broader meaning than flying cat:

flying cat: arboreal nocturnal mammal of southeast Asia and the Philippines resembling a lemur and having a fold of skin on each side from neck to tail that is used for long gliding leaps
placental mammal: mammals having a placenta; all mammals except monotremes and marsupials

Other hypernyms of flying cat include eutherian, eutherian mammal, placental.

flying cat (noun)	placental mammal (noun)
East Indian flying squirrel	mammals having a placenta; all mammals except monotremes and marsupials
arboreal nocturnal mammal of southeast Asia and the Philippines resembling a lemur and having a fold of skin on each side from neck to tail that is used for long gliding leaps